How can water be 0°C or colder without being frozen? Assuming there are no impurities.
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It truly depends on the pressure at that point. There lots of graphs that show what is known as a phase diagram. It shows the phases of a substance at pressures vs Temps. So when a liquid is not frozen, given pure water, then it must be warmer than 0⁰/32⁰ or be pressure regulated. There is also this thing called a triple point. Look it up, very interesting.
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